Series_M21_Metal_tube_flowmeters
6Pages

Metal tube flowmeters Series M21 Variable area flowmeter for low flows of liquids, gases and steam          Metallic tube with a robust construction Indication by means of magnetic coupling Scales calibrated in l/h, m3/h, kg/h, t/h, %, etc. High performance measurement in extreme working conditions and high resistance to corrosion Low pressure drop Regulating valve optional Vertical or horizontal connections Damping mechanism to avoid float bounces in gas and steam applications Flow rate: - Water: 0.4 l/h ... 1000 l/h - Air: 12 Nl/h ... 30 Nm3/h Accuracy: 4% (qG=50%) Connections: - ¼” ... ¾” BSP / NPT - Sanitary connections according to ISO 2852, SMS 1145, DIN 11851, TRI-CLAMP® Materials: EN 1.4404 (AISI 316L) Local indication Options: - 1 or 2 limit switches - Electronic transmitter with 4-20 mA output for safe or hazardous area (Ex ia IIC T4...T6 Ga / Ex ia IIIC T85ºC Da protection, ATEX certified). HART prot

Working principle The M21 flowmeter is a metal tube variable area flowmeter for low flows. It is based in the principle of variable area, which is obtained by a float that moves up and down inside a calibrated orifice. The force from the fluid, as it flows from the bottom to the top, displaces the float until it reaches an equilibrium point that is a function of: - E = force of the fluid flow - Pf = weight of the float  Working pressure: - PN16 (with regulating valve) - PN40 (without regulating valve) (others on request)  Sanitary connections according to ISO 2852, SMS 1145, DIN 11851,...

Metal tube flowmeters Series M21 Dimensions M21-R (BSP thread) M21-N (NPT thread) M21-HR (BSP thread) M21-HN (NPT thread) M21-HRA (BSP with valve) M21-HNA (NPT with valve) Flow ranges Model Nº Flow scales AISI 316L float 7.95 g/cm³ l/h water

Limit switches and transmitters Adjustable limit switch M1-AMD  Power supply: 2-wire system, 12 … 36 VDC NAMUR (EN 60947-5-6) 3.5 mm slot type inductive detector activated by vane, mounted in the indicator housing.  M1-AMD1 … 2: 1 … 2 adjustable limit switches  Power supply: 8 VDC  Ambient temperature: -25°C ... +70°C  ATEX certification Ex ia IIC T4...T6 Ga / Ex ia IIIC T85ºC Da  Analog output (4-20 mA): - Error: < 0,6% of the magnet position - Maximum load in 4-20 mA loop: 1,1 kΩ (with 36 VDC power supply)  Ambient temperature: -5ºC ... +70ºC  Transmitter connector:...

Metal tube flowmeters Series M21 Float damping system (for gas and steam applications) Ceramic, PEEK or metallic piston system for avoiding float oscillations in flowmeters for gas and steam service, obtaining stable readings even with very low working pressures and low gas densities. Available for ¼” ... ¾”. Components: - Upper float stop - Float - Piston - Piston locking circlip - Guide cylinder NPT system Total length M21 with damping system NPT: ¼” = 186 mm ; ½” = 212 mm ; ¾” = 222 mm Constant flow regulators RCA / RCD The M21 flowmeters are designed to incorporate the RCA and RCD...

PRESENCE IN MORE THAN 50 COUNTRIES ALL OVER THE WORLD Tecfluid S.A. Narcís Monturiol 33 08960 Sant Just Desvern Barcelona Tel: +34 93 372 45 11 Fax: +34 93 473 44 49 tecfluid@tecfluid.com www.tecfluid.com Quality Management System ISO 9001 certified by Pressure Equipment Directive 97/23/CE certified by ATEX European Directive 94/9/CE certified by HART® is a registered trademark of HART Communication Foundation The technical data described in this specification sheet is subject to modification without notification if the technical innovations in the manufacturing processes so require....